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J. W. RENO TOOTNED GEAR POWER TRANSMISSION.

APPLICATION FILED .ULY 22. I918.

J. W. RENO.

I OOTHED GEAR POWER TRANSMISSION.

APPLICATION FILED JULY 22.n91s.

1 ,3 14,701 Patented Sept 2, 1919..

[TS-SHEET 2.

2 SHE UNITED STATES PATENT OFFICE.

. JESSE w. RENO, or new YORK, N. Y.

"I'OOTI-IIEDI-GEAR rownnrrm vsmissioiv.

To all whom it may concern:

Be it known that I, JESSE W. citizen of the United States, residing in New York, in the county of New York and State of New York, have invented a new and useful Improvement in TIOOthed-Gear Power Transmissions, of which the follow ing is a specification. a

My invention relates to a new and useful improvement in reduction gears in toothedgear transmissions; and it is 1 especially adapted to staggered spur; gear driving mechanism as, for example, toothed gear turbines. By myinvention it 18 practicable to maintain in satisfactory operation, a staggered spur gear power transmission drive which will run smoothly and almost noise lessly. It has been very difficult hereto.- fore to make a successfully operable staggered power gear drive because it is practically impossible or virtually impracticable to set the staggered gearteeth of the drive gear to register accurately with the staggered gear teeth of the driven gear. In my invention, the teeth on the drive gear can accommodate themselves in operation to inaccuracies of the teeth on the driven gear. Gears made up of staggered straight teeth, in accordance 1 with my invention, will be free from the friction due toside thrust in operation that is found in spiral. or herring-bone gears; furthermore, my invention takes care of defects or inaccuracies in the alinement of the shafts on which the gears are mounted.

I will now proceed to describe my inven- Fig. 2 is a cross-section on the :line a--b of the Fig. 1.

Fig. 3 is an end view of the spring key and pressure bars involved in my invention.

Fig. 4 is a plan view of the springkey involved in my invention.

Fig. 5 comprises views of the end and side of one of the pressure bars.

Fig. 6 is a side view partly insection of my invention of staggeredtoothed gears'and spring keys, securing the drive gear to a" shaft. 0

Fig. 7 is anend view of Fig. 6. Similar letters of reference designate the correspondingpartsin all the figures of the drawings.

Specification of Letters Patent.

RENO, a U

each bar being rounded off or ,In the drawings, I have indicated a shaft, 1, in this case, for example, the drive shaft of a turbine or other sourcemof power, T, and shown the usual bed plate, 2. therefor, on which are the usual stationary journal bearings, 3, for the journals of the shaft, 1, of the usual spur gear pinion; there being the conventional coupling, C, between the drive shaft, 1, andthe turbine, shaft,'t; instead, however, of employing the usual form Patented Sept. 2,1919.

Application filed July 22, 1918. Serial No. 245,985.

of pinion drive shaft, with the gear pinion fast thereon to turn therewith, I form seats, ways or recesses, 4, in the surface of the drive shaft, parallel withthe axis ofthe shaft. The seats may be spaced apart from each other, around the surface of the shaft, asmany as may be considered desirable; in

the figures in the drawing, I have shown only one seat in the surface of the shaft, 1;

but the showing of only one seat is merely for the sake of convenience. Instead .of usin the usual gear pinion, formed integrail} with the drive shaft or rigidly secured thereto, to be driven thereby without turning on the shaft,I employ what I call an annular gear toothed ring, 13, mounted to turn slightly on the shaft, 1, and a spring key, 5, between the shaft and ring, to connect together the shaft and ring. The key is composed of spiral convolutions with a crosssection of material removed from each.

alternate coil, to leave an open slot, 6, in the coil, as shown in the drawings. The purpose of the slot is to permit the ends of the coils to be moved toward each other under suflicient pressure; upon the pressure being reduced or removed, the ends will move in a direction away from eachother. tent of movement of the sides in the direc- The extions toward and away from each other is comparatively slight and only sufficient to efl'ect-the purpose I have in mind in my invention. Opposite the slot, I have increased the amount of material at the ends 1 of the coils to constitute shoulders, 7 In the shoulders, I form concaveor rounded out seats,

10, in. the shaft, 1; in the seats, 10, I place what I call 'pressure bars, 11; one side of convexly I)". l, i i 1 curved, as shown in the drawings at 12, to bear in the curved seats 8 in the spring .lieys 5. The depth of the seats, 10, is about'half of the thickness of the "bars, 11; :room for fpresent invention by my description and the top half of the bars, 11, between the shaft, .1, and the annular ring, 13, mounted loosely on the shaft, is provided for by a seat, 14:, cut in the ring. The =pressu1 'ebarsor pieces, 11, engage the springkey, 5 on 0pposite sides of the slot, 6-, and communicate pressure evenly from the shaft, '1,=through the spring'key 'to the ring, 13.

liiflFig. 4 I have shown the spring key separately, coi'n prising a slotted cylindrical rco'ile'd sprin 15, inwhich the slot, 6, is

- formed in thealternate convolutions, 16, of

the spring, In the drawings, 1 have shown gered, as indicated at "17, in Fig. 1. Of course, desire not to 'be limited to any par- 'ticnlar number of rings'or to the feature of staggering the {gear teetln a's it is plain that my invention is applicable 'tojany number of rings and arrangement of teeth. When my improved ,gear driving mechanism isv assembled the gear teeth on the rings '13 -Will=be intermeshed with the teeth of the usual "gear pinion and driven avheel.

It will be understood that in the operation of my improved gear, the spring key is always under "heavy compression in trans mitting power In the driving :operation, the shaft, 1, will turn, and drive the pressure bar, =11, on one side of the spring key,

"5 which bar will press one side of the :key toward the "other side thereof, thus narrowing'the slot, 6, to the extent oftheresistance :of the convolution; however, the :design is not to {have the slot, 6-, .close in or :in other words that :the ends of the spring ikey shall not be abutted together, %but afi'llilil) the spring ikey shall always .act as a spring ibetweenvthe drive shaft and :the :toothed rings If for any reason the drive shaft and shaft of :the driven :gear wheel are out .of :line at some time in operation or :the zteeth :of the rings and :the teeth of the :driven wheel also out of line and the stagger of the teeth. on, the rings altered in eifect,ffit {merely {means that one tr :more'of the rings :are under more pressure than another or some rather rings,

and when the pressure on those particular their inorma'l relative -,position [by the back pressure of :the spring. keys; in brief, the

whole face of :the pinion gear :as constituted I ofgtoothecl rings will i be "free 'at all times to improvement upon the inventions patented toimeinthepatents numbered 965,408, July 20, 1910, and 1,284,213, July 24:, 1917. Of course, it is n y iintention not to limit my showing of it in the application for the patent; but on the contrary, to include within its scope all devices which may be held. to be the mere equivalent of my invention.

Havmg described and shown mean-s for --carrying out my invention, what I .claim seats, connecting the shaft and pinion :to-

gether, the tubing comprising spiral convolutions, reach alternate coil being .open slotted, constituting, a resilient member be- -tweenwthe shaft .and gear pinion,v

2. In a toothed Sgear .power transmission, I a,-c'0mbinati'oncomprising a drive .shaft, and a gear pinion eloosely mounted (thereon, the shaft and pinion having ke y seats therein,

:resili'ent itubin' in the seats, connecting the shaft and pinion together, the tubing comprising spiral :convolutions, each alternate coilbei'ngslotted longitudinally toform an open slot when the .coils :are assembled together, the ends oflthe, convolutions being shouldered ':to effect .an engagement between tubing, the shaft and the gear pinion.

13. In a toothed gear-power transmission, a combination :comprising a drive shaft, and a gear pinion loosely iHlOLllllZGdid'illGFGOll, to turn Ithereon, the shaft and pinion haying key seats therein, .a resilient tubingin the seats, the tubing comprised rofspiralnconvolutions, each :alternate -;coi=l being slotted longitudinally :to form .an open-Aslot, the

sides rofrthe :convolutions .ast Itheir ends being shouldered, and pressure bars nr'the seats {engaging rtheshoulders ;and the shaft land .zpini'oir, {to effect a connection between the shaft, the pinion andthe tubing.

4. in :a toothed .fgear power transmission,

a combination comprising a drive .shaft, :and a gear pinion loosely mounted thereon, to turn thereon, the shaft and pinion having :key sseats therein, a resilient tubing-in the seats, the tubing comprised oft/spiral convo- ,luti-ons,'=each alternate coil. slotted longitudinally to form :an openslot, the sides of v the -.convolutions at their ends being: shouli-dered, the shoulders having. grooves therein, pressure lDEt-IS between the shaft and pinion,- one side of the bars engaging the grooves in the shoulders and the other side theshaft and pinion. a I a. I

5. In ;a toothed gear ,power transmission,

a combination comprising a drive, .shaft,,and

a gear pinion losely mounted thereon, to

turn thereon, the shaft and pinion having grooves therein, pressure bars in the seats key seats therein, a resilient tubing in the between the shaft and pinion, one side of 10 seats, conneeting the shaft and pinion tothe bars being rounded to engage the gether, the tubing comprised of spiral congrooves in the shoulders.

Volutions, each alternate coil being slotted In testimony whereof, I have signed my longitudinally to form an open slot, the name to this specification.

sides of the eonvolutions at their ends bein shouldered, the shoulders having rounde JESSE W. RENO.

Copies of this patent maybe obtained for five cents each, by addressing the Gommissioner of Patents, Washington, D. 0. 

